Improved core-bar for pipe-molding



@mais rares JOHN DEMAREST, OF MOTT HAVEN, NEV YORK, ASSIGNOR TO THE J. L.

MOTT IRON VORKS.

BMPROVED CORE-BAR FOR PIPE-MOLDING.

Specification forming part of Letters Patent No. $4,637, dated April 8, 1856.

tion, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a plan of my improved core-bar in a core-box, and Figs. 2 and 3, vertical sections taken at the lines Ac and B b of Fig. l. Fig. 4 is a plan of a core-bar for a curved pipe with a branch; Fig. 5, a section at O c of Fig. 4, showing the wing and core-bar separated; and Fig. 6, another Section at D d of Fig. 4.

The same letters indicate like parts in all the figures.

The mode heretofore practiced for making 'cores for curved, elbow, or branch pipes is to take an'irou rod or rough piece of wood of the form of the curve or angle of the pipe and to pack the sand into such bar to get the required diameter of the caliber of the intendedpipe, and to sustain such cores by bearers above and below to prevent the core from being forced up or down by the pressure of the molten metal when run into the mold. Vhen casting pipes having branches it is necessary to cut this bar to get it out of the cast pipe, and the bearers of necessity leave the casting imperfect.

The object of my invention is to avoid these difficulties; aud it consists in making the corebar with end plates or wings, one or both separate, and iitted on by a slip or other equivalent joint, which plates or wings rest on the surface of the core-box in making the core and on the face of the flask in the act of molding, vto sustain and hold the core-bar in a true position without the use of bearers, so that the surface of the` pipe inside and out may be cast smooth.

In the accompanying drawings, a represents a core-box, and b the main metallic core-bar for making the core'of a curved pipe. This bar is provided with projecting flanges c c,

. which project from each side, to hold the sand which forms the lower half of the core. At one end this core-bar is provided with a plate,

d, forming two wings, the bottom of which rests on the surface of the core-box; and at the other end there is a similar plate, e, fitted thereto by a dovetail joint, f, so that it can be taken off and put on readily. These plates should project on each side of the bar to sustain and balance the bar and core when formed thereon, no matterhow muchit may be-curved. The under face of the two plates should be on a level with the upper surface of the core-bar, so that when the plates rest on the surface of the core-box or flask the upper surface of the core-bar shall be in the-plane of the axis of the intended pipe. After the lower half of the core has been formed by ramming the sand in the lower half of the core-boX and around the core, the upper half is then formed by putting on the upper half of the core-boing, and then ramming in the sand through the ends.

The upper half of the core-box is removed, l

the core lifted out and put in the mold with the plates resting on the iiask,which holds the core in its place without any other support, so that the entire length of the pipe can be cast of any curve desired without interposing any support between the surface of the core' and the mold 5 or the core-bar may be made with the end plates or wings as represented in Figs. 4, 5, and 6, where the upper surface of the plates cl and e are on the same le-vel with the upper surface of the main bar, in which case they would be let into the surface of the core-box and flask. Instead of connecting the wingl c with the bar by means of a dovetail joint, the cud of the bar is made with two side lips, 'i i, a short distance from the end which is cut down (see Fig. 5) to slip under the plate c, the said platev having two stems, 7117i, one on each side of the bar, the ends of which enter recesses made in one of the proj ecting flanges c. On the curved side the main bar b is formed with a wedging dovetail mortisej, to which is fitted a dovetail tenon, 7s, on the end of a branch core-bar, Z, to form a branch core-bar in a core-box of corresponding form. The fitting of the dovetail connection will secure the branch core to the main core, which will be fullybalanced in the mold by the wings or plates d c resting on or in the ask. After the pipe has been cast the branch core-bar can be readily'separated from the main core-bar, so as to be drawn out of the pipe, and then by removing,` the plate e the in the pipe after the pipe has been cast; but

main core-bar can be drawn out of the main pipe, whether curved or straight, for it will be obvious that the branch or elbow to a straight pipe can be applied in like manner.

I have thus specified the nature of my invention and the mode of construction which I have tried with success, together with some modifications, and this I have done the better to distinguish the character or mode of operation of my said invention from the mere modes oi application, to which I wish it to be distinctly understood I do not limit myself.

I am aware that core-bars have been made with wings between which to pack the sand, and which have ell'ect to bind and hold the sand forming the core, and this I do not claim as my invention; and I ani also aware that core-bars have been made with branches connected therewith by dovetail joints, so that the branches ofthe core-bar can be separated these as heretofore made required to be sustained centrally in the mold by inside bearers, which injure the castings. I do not, therefore, wish to be understood as making claim to the connecting of the branches with the main. core-bar by dovetail joints irrespective ot' the side wings or plates which rest on the surface ofthe flask to sustain the branches in a true central position without bearers.

What I claim as my invention, and desire to secure by Letters Patent, is-

Making core-bars for molding` curved, elbow, or branch pipes and other such like hollow castings with sustaining plates or wings at the ends, substantially as and for the purpose specified.

JOI-IN DEMAREST.

Xlffitiiesses:

XVM. II. Bisi-lor, ANDREW DE LACY. 

